Suntex CT-6110-POL, Руководство по эксплуатации

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8.3 Free Cl
2
calibration
In order to maintain the correctness of chlorine reading, it is recommended to make electrode
calibration regularly. In addition, when a new replacement chlorine electrode or a stop operation of
motor happens, it is also recommended to re-make calibration work. Be noticed that it is necessary to
power on in normal circumstances and run the instrument continuously at least one hour before
starting calibration. It helps the electrode be fully polished by ceramic beads before calibration. (This
step is required when first operation or when motor has been stopped.)
There are two types of chlorine electrode calibration: Zero point calibration and Span calibration.
Zero calibration is to calibrate the current offset(
μ A) of the electrode. Span calibration is to calibrate
the relative slope(%) of the electrode. Usually, it is not necessary to make zero calibration. The
following chapter describes there two calibration works.
8.3.1 Zero point calibration
There are two ways of zero calibration: First way is to make electrode open of the working
electrode(gold electrode) and counter electrode(silver electrode) by pull out the wiring from
terminal 11
th
and terminal 12
th
and thus it becomes electrode open status, or by stopping the
motor function and then move the sensor box to the clean position to let the free Cl
2
electrode
hang in the air and dry. While the measurement value becomes stable, and then start the zero
calibration. The other way is to apply active carbon filtered water(Residual chlorine has been
removed from the water. For the piping configuration please refer to Ch 2.3.2, (illustration B,
Auto-Zero calibration piping configuration.) or pure water. Turn off the original inlet valve and
then turn on the active carbon filtered water or pure water inlet valve to input it into
flow-through chamber. After the measurement value becomes stable, then start the zero
calibration. This method can be executed by Auto Zero function(Cln/Auto Zero relay) to set the
on and off duration for auto switching. The method and operation order of Auto Zero function is
the same as above process but done by automatically instead of by manually. When applying
auto zero calibration, the duration is recommended at least 24 hours or more.
The process of manual zero calibration work is as follows.
Press to confirm it.
Press to confirm it.
Press or
to select zero
calibration
Shows zero point
current value. Press
to directly
finish the reading,
or wait until the
instrument show the
final result.
Press to
continue the
final part of
zero calibration.
Press to
activate the span
calibration work.
Or press to
finish the
calibration and
display the results.
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